sə̇ˈmestə(r) noun
( -s )
Etymology: German, from Latin semestris half-yearly, from sex six + mensis month — more at six , moon
1. : a half a year : a period of six months
2. : either of the two periods of instruction commonly 18 weeks in length into which an academic year is usually divided — compare quarter 4b
3. : any term of instruction : session
the second semester of summer school